Use attribute for sort
Use attribute for sort

Using sort against dicts won't work in py3 (and may not work as expected
in py2), since dictionaries can not be compared unless we pass an
attribute value.

Change-Id: Ib11f78d639ea7d520896482253e7a12eb862d598

openstack/openstack-ansible-lxc_container_create,openstack/openstack-ansible-lxc_container_create